Manningham injury could open door for A.J. Jenkins

Finally, in the 13th game of his rookie season, wide receiver A.J. Jenkins might step onto the field.

That was the takeaway from 49ers coach Jim Harbaugh’s session with reporters today after practice. Wide receiver Mario Manningham, nursing a shoulder injury, missed practice and was listed as doubtful for Sunday’s game against Miami — and Kyle Williams already is out with his season-ending torn ACL.

This should create a long-awaited chance for Jenkins, the team’s first-round draft choice from Illinois. Michael Crabtree and Randy Moss are still ahead of Jenkins, and so is Ted Ginn Jr., but the 49ers are likely to use more than three wide receivers.

He then elaborated on Jenkins’ development in practice in recent weeks, saying, “I’ve seen progress from A.J. He’s been on his assignments and he’s executed well when he’s been out there. He’s giving great effort and football rewards that effort.”

The 49ers listed 10 other players on today’s injury report, including linebackers Patrick Willis (shoulder) and NaVorro Bowman (shoulder), running back Frank Gore (wrist), kicker David Akers (pelvis) and linebacker Aldon Smith (shoulder). All 10 are listed as probable for Sunday; Smith was the only one limited in practice today, according to the team.